Vortex Motion in High-T_c Films and a Micropattern-induced Phase Transition

R. Wördenweber¹, E. Hollmann¹, J. Schubert¹, R. Kutzner¹, and Ajay Kumar Ghosh^1,2

¹Institut für Bio- und Nanotechnologie (IBN) and
JARA-Fundamentals of Future Information Technology ,
Forschungszentrum Jülich , D-52425 Jülich, Germany
²Department of Physics, Jadavpur University, Kolkata 700 032, India
E-mail: [email protected]

Abstract - A micropattern-induced transition in the mechanism of vortex (magnetic flux quantum) motion and vortex mobility is observed in high-T_c thin films. The competition between the anomalous Hall effect (AHE) and the guidance of vortices by rows of micro-holes (antidots) lead to a sudden change in the direction of vortex motion that is accompanied by a change in the critical current density and microwave losses. The latter effect demonstrates the difference in vortex mobility in different phases of vortex motion in between and within the rows of antidots.

Keywords - vortex matter, vortex manipulation, anomalous Hall effect, guide motion of vortices, high-T_c films

Submitted June 25, 2009; accepted July 28, 2009.  Reference No. ST116; Category 2, 4.
This paper is an expanded version of Appl.Phys. Lett. 94, 202501 (2009), by the same authors, which should be cited as reference.